The أدعية وأذكار حصن المسلم - بدون app, developed by Mohamed Sultan, is a free lifestyle app available on Android. It is a comprehensive collection of daily prayers and invocations mentioned in the book "Fortress of the Muslim" that are essential for our daily lives and dealings with people. The app is designed to be simple and user-friendly.

The app includes a wide range of invocations such as morning and evening prayers, prayers for different occasions, supplications for the mosque, bedtime prayers, and recitations from the Quran and Sunnah. Additionally, the app offers an electronic rosary to help users keep track of their prayers and an index that makes it easy to navigate through the various invocations. The app is also free of advertisements and can be used without an internet connection. Users can easily share the app with their friends and family, contributing to its widespread use.